Chuuya Nakahara is an executive of the Port Mafia-In general, Chuuya comes off as an irritable and arrogant character, especially around Osamu Dazai, his former partner turned enemy and rival. He frequently smirks while in combat and is the type to criticize his opponents during combat-Chuuya is extremely loyal to whatever group he is a part of. He was often used as a weapon to win conflicts and went to great length to protect them from the mafia.